1、exchange

交换;互换

We exchanged addresses and Christmas cards.

我们交换了地址和圣诞贺卡。

The two men exchanged glances.

那两个男人互相扫了一眼。

交战;交火

There was an exchange of fire during which the gunman was wounded.

有过交火，其间那名持枪歹徒受伤了。

This could intensify the risk of a nuclear exchange.

这可能会加剧爆发核战争的危险。

（不同国家人们之间的）交流，互访

a series of sporting and cultural exchanges with Seoul.

和首尔之间的一系列体育和文化交流

educational exchanges for young people.

面向年轻人的教育交流

2、discussion

讨论;商讨

There was a lot of discussion about the wording of the report.

关于此则报道的措辞议论纷纷。

Council members are due to have informal discussions later on today.

委员会成员定于今日晚些时候进行非正式讨论。

论述;详述

For a discussion of biology and sexual politics, see chapter 4.

生态政治和性别政治论述请见第4章。